A peshmerga fighter looks out of the entrance of an underground tunnel built by Islamic State fighters. The Kurdish forces found the tunnel in the town of Badana in Iraq which was liberated from the Islamic State group on Monday. The fighters built tunnels under residential areas so they could move without being seen from above to avoid airstrikes. Photo Bram Janssen/AP.

Migrants stand next to their tent at a camp set near Calais, northern France, Wednesday. Thousands of migrants have been scaling fences near the Channel Tunnel linking the two countries and boarding freight trains or trucks destined for Britain

A miner with a donkey makes his way through the low and narrow tunnel leading out of a coal mine in Choa Saidan Shah in Punjab province. Workers at the Choa Saidan Shah mine dig coal with pick axes, break it up and load it onto donkeys, to be transported to the surface

Crossrail construction workers on the Connaught tunnel below the Royal Docks in east London. Derelict since 2006 when rail services stopped using the route, works are taking place to deepen, strengthen and widen the structure to ensure that is ready for the arrival of crossrail trains, from 2018 up to 12 trains an hour in each direction will run through the tunnel first built in 1878 linking Woolwich to Custom House, Canary Wharf and Central London.

A worker is seen inside the Cuncas II tunnel that will link the canals being built to divert water from the São Francisco river for use in four drought-plagued states in Brazil, a project that is three years behind schedule and has doubled in cost from the original estimate of $3.4bn, near the city of Mauriti, Ceará state

A Crossrail tunnel under construction 35 metres below the streets of Whitechapel, east London, one of the most challenging sites in the Crossrail project. The completed service will run from Maidenhead and Heathrow in the west to Shenfield and Abbey Wood in the east. Construction is expected to be completed in 2017, with services running in 2018.

A worker inspects the first completed section of London’s new Crossrail tunnel, which will provide new train links across the UK capital to Heathrow airport. Tunnelling machine Phyllis completed the 6.8km section between Royal Oak in the west and central Farringdon after 18 months of work. Crossrail, Europe’s largest construction project, is expected to be finished in 2019.

A tunnel worker ascends on a rope inside a smuggling tunnel dug beneath the Gaza-Egypt border in the southern Gaza Strip. Hamas is struggling to meet its payroll in the Gaza Strip, where income from taxes has been badly hit since neighbouring Egypt started destroying a network of tunnels used to smuggle food, fuel and weapons into the Islamist-run enclave.